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Letters Patent No. 63,724; dated September 10, 186i'.

IMPROVEMENT IN VALVE-GEAR FOR STEAM ENGINES.

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TO ALL WHOM IT MAY CONCERN: l, A

Be it known that I, JOHN R. FISH, of Fort Wayne, in the county of Allen, and State oi' Indiana, Yhave invented a new and improved Valve-Motion; and I do hereby declare that the following is a full,.clcar, and

exact description thereof, which will enable others skilled inthe art to'malie and use the saine, reference being i had to the accompanying drawings, forming part of thisspecication.

This invention relates to a new and improved arrangement, whereby steam-valves which are controlled in their motion by a link, are made to opera-'te uniformly under all circumstances during the `revolution or stroke of the engine, and the invention consists principally in the arrangement of the link aswill be hereinafter described.

Figure 1 represents a vertical section. of the link and its attachments, showing sectionsof the eccentricrods (in red) attached to the link, the section being through the line n; w ofg. 2. l

Figurejs a view o'..the arrangement from -the line y gj of fig. 1.

. Similar letters of reference indicate like parts.

A is a guide which controls the vertical motion of the link. B is a sliding block which is fitted to the guide A, and which moves up and down on it. C is a guide which is attached to the block B, the line of motion which is controlled thereby being at a rightangle with the line controlled bythe guide A. D is a sliding block which is fitted to this guide, and which moves horizontally upon it. E is the' link which is attached to the block I) by the pivot seen at a, upon which pivot the link oscillates. The eccentric-rods are attached to the link at the points marked K and L. When the link is raised or lowered for the purpose of cuttingfo'' steam or reversing the motion of the engine, it moves, by its connection` with the block B on the guide A, always on the saine vertical line, the point of its suspension being on the block B. When Athe link is moved by its eccentric-rods, its motion is always on the same horizontal plane, because it is condned by block D to thevguide C;in other words it does not liftf As heretofore used the hanger G supported the link, and was the radius of an arc whose centre was at I, a centre which changed its position at every point of cutting oi' steam rendering thereby the motion of the valve necessarily unequal at the different points of working steam, the link moving in this are. As the link must always move on a vertical or horizontal line, all lifting by the eccentric-rods is prevented, and consequently the motionoi' the 'valve is rendered uniform. H is a rock-shaft to which the reversing-rod is attached by the'arm J. m is the arm to which the valve-1od is attached, and represents the sliding block within the link, by the position ofV which the throw of thevalve is regulated. u is the arm which is attachedv to the sliding block 1I, and to `the shaft of the arm m, l Y

The improvement herein shown end described will be at once understood. and appreciated by thosewho are acquainted with the locomotive or other engines where the motion of the valve is controlledA bythe link, and it will be seen that thelink can be made of any desired length, thereby increasing the delicacy ofthe motion.

Whatl claim as new, and desire td secure by Letters Patent, isi L l 1. The guide A placed in an upright position, andiperpendicular to the line ,of motion fromthe driving-shaft, upon which guide Iche link is raised and lowered, substantially as showin and described. l

2. I claim the combination and arrangement oi'- the guide A, horizontal guide C, and blocks B I), substan tially as described for the purpose speciiied. y.

IGI-IN R. FISH.

Witnesses:

H. C. HARMAN', Giro.I S. HAMMAX. 

